<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" left-arrow title="黑马头条"></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div class="loading-wrap" v-if="isLoading">
        <van-loading color="#3296fa" vertical>加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="articleLis.title" class="article-detail" ref="content">
        <!-- 文章标题 -->
        <h1 class="article-title">{{articleLis.title}}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image class="avatar" slot="icon" round fit="cover" :src="articleLis.aut_photo" />
          <div slot="title" class="user-name">{{articleLis.aut_name}}</div>
          <div slot="label" class="publish-date">{{articleLis.pubdate|forMaterDate}}</div>

          <!-- <van-button
            class="follow-btn"
            round
            size="small"
          >已关注</van-button> -->
          <!-- 关注组件 -->
          <userFollowed v-model="articleLis.is_followed" :autId="articleLis.aut_id" />
          <!-- v-model解析
          1 属性：value="articleLis.aut_id"  传子-->
          <!-- :value="articleLis.is_followed" -->
          <!-- 2 事件 @input="articleLis.is_followed=$event" -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content" v-html="articleLis.content"></div>
        <van-divider>正文结束</van-divider>
        <articleComment @updateTotal="totalCount=$event" :source="articleLis.art_id" />
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="is404" class="error-wrap">
        <van-icon name="failure" />

        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button @click="loadArticel" class="retry-btn">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>

    <!-- 底部区域 -->
    <div class="article-bottom" v-if=" articleLis.title">
      <van-button class="comment-btn" type="default" round size="small">写评论</van-button>
      <van-icon name="comment-o" :info="totalCount" color="#777" />
      <!-- 收藏组件 -->
      <collect :arcticleId="articleLis.art_id" v-model="articleLis.is_collected" />
      <!-- :value="articleLis.is_collected"
@input="articleLis.is_collected=$event" -->
      <!-- 底部点赞 -->
      <Tags v-model="articleLis.attitude" :artId="articleLis.art_id" />

      <van-icon name="share" color="#777777"></van-icon>
    </div>
  </div>
  <!-- /底部区域 -->
</template>

<script>
import { getArticleInfo } from '@/api/article.js'
// import CommentItem from './components/commentitem.vue'
// 引入关注功能
import userFollowed from '@/components/user-foolowed.vue'
import collect from './collect/index.vue'
import { ImagePreview } from 'vant'
import articleComment from './components/articleComment.vue'
import { addUserfollwed, deleteUserfollwed } from '@/api/users.js'
import Tags from './components/Tags.vue'
export default {
  components: {
    userFollowed,
    collect,
    articleComment,
    Tags
    // CommentItem
  },
  data () {
    return {
      // 数据列表
      articleLis: {},

      // 显示加载状态
      //       加载中，显示 loading
      // 加载成功，显示文章详情
      // 加载失败，显示错误提示
      // 如果 404，提示资源不存在
      // 其它的，提示加载失败，用户可以点击重试重新加载
      isLoading: false,
      // 是否为404
      is404: false,
      totalCount: ''

    }
  },
  // porps接收路由params的参数
  props: {
    articleId: {
      type: [Number, String],
      required: true
    }
  },
  methods: {
    async clickBtn (userId) {
      this.isFollowed = true
      try {
        if (this.articleLis.is_followed) {
          await deleteUserfollwed(userId)
          this.$toast('取关成功')
        } else {
          await addUserfollwed(userId)
          this.$toast('关注成功')
        }
        this.articleLis.is_followed = !this.articleLis.is_followed
      } catch (err) {
        if (err.response && err.response.status === 400) {
          return this.$toast.fail('不能关住自己')
        }
        this.$toast('操作失败')
      }
      this.isFollowed = false
    },
    async loadArticel () {
      try {
        this.isLoading = true
        const { data: res } = await getArticleInfo(this.articleId)
        this.articleLis = res.data
        this.isLoading = false
        console.log(this.articleLis)
        // 处理异步问题，调用$next的让数据同步视图
        this.$nextTick(() => {
          this.preciewImg()
        })
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.is404 = true
        }
        this.$toast('获取失败')
        this.isLoading = false
      }
    },
    // 图片预览处理
    preciewImg () {
      console.log(this.$refs.content)
      // 获取文章详情里的所有的图片
      const imgs = this.$refs.content.querySelectorAll('img')
      const images = []
      imgs.forEach((item, index) => {
        images.push(imgs.src)
        // 点击每一项图片
        item.onclick = function () {
          ImagePreview({
            images: images,
            startPosition: index
          })
        }
      })
    }
  },
  created () {
    // 路由传参
    this.loadArticel()
  }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px;
    bottom: 88px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px;
      padding: 50px 32px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px;
      .avatar {
        width: 70px;
        height: 70px;
        margin-right: 17px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px;
        height: 58px;
      }
    }

    .article-content {
      padding: 55px 32px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 122px;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px;
      color: #666666;
      margin: 33px 0 46px;
    }
    .retry-btn {
      width: 280px;
      height: 70px;
      line-height: 70px;
      border: 1px solid #c3c3c3;
      font-size: 30px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px;
      height: 46px;
      border: 2px solid #eeeeee;
      font-size: 30px;
      line-height: 46px;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px;
      .van-info {
        font-size: 16px;
        background-color: #e22829;
      }
    }
  }
}
</style>
